Adding String to Split formula

I have a crystal report where I have to use the split function to gather the necessary information I need for the report. The information is actually a network path on our server. Problem is that the network path does not have the actual server address in it. I want to see if I can do a string concatenation to the information i'm using the split function for to get the full address.
Ex. String I need to add: https://selfservice.mss.com
Split information: /bin/product/details/

Expected result: https://selfservice.mss.com/bin/product/details/